然后将 aSRC_Const_Buffer 数组定义为常量,即可分配到 RO 区域,aDST_Buffer 定义为普通的全局变量或静态变量即可,因为内存区域从 0x20000000 开始,也就是 DTCM RAM。
好了,代码主体部分如下:
(完整的代码可以在 https://download.csdn.net/download/luckydarcy/10104739 下载)
- #define SRAM1_ADDRESS_START (0x20020000UL)
- static const uint32_t aSRC_Const_Buffer[BUFFER_SIZE] =
- {
- 0x01020304, 0x05060708, 0x090A0B0C, 0x0D0E0F10,
- 0x11121314, 0x15161718, 0x191A1B1C, 0x1D1E1F20,
- 0x21222324, 0x25262728, 0x292A2B2C, 0x2D2E2F30,
- 0x31323334, 0x35363738, 0x393A3B3C, 0x3D3E3F40,
- 0x41424344, 0x45464748, 0x494A4B4C, 0x4D4E4F50,
- 0x51525354, 0x55565758, 0x595A5B5C, 0x5D5E5F60,
- 0x61626364, 0x65666768, 0x696A6B6C, 0x6D6E6F70,
- 0x71727374, 0x75767778, 0x797A7B7C, 0x7D7E7F80
- };
- static uint32_t aDST_Buffer[BUFFER_SIZE];
- int main(void)
- {
- uint32_t counter = 0;
- uint32_t *pBuffer = (uint32_t*)SRAM1_ADDRESS_START;
-
- if (HAL_Init() != HAL_OK)
- {
- Error_Handler();
- }
- /* Initialize LEDs */
- BSP_LED_Init(LED1);
-
- /* Configure the system clock to 216 MHz */
- SystemClock_Config();
- BSP_LCD_Config();
- /* Set to 1 if an transfer error is detected */
- transferErrorDetected = 0;
-
- /* Fill 128 bytes with 0x55 pattern */
- memset((uint8_t*)SRAM1_ADDRESS_START, 0x55, sizeof(aSRC_Const_Buffer));
- /* TODO:Enable MPU and change SRAM region attribute
- * set write-back policy on SRAM */
- MPU_Config();
-
- /* Enable Data cache */
- SCB_EnableDCache();
-
- /* Copy data from Flash to SRAM by CPU */
- for (counter = 0; counter < (sizeof(aSRC_Const_Buffer)/4); counter++)
- {
- *pBuffer++ = aSRC_Const_Buffer[counter];
- }
-
- //* Configure and enable the DMA stream for Memory to Memory transfer */
- DMA_Config();
- /* Wait for DMA end-of-transfer */
-
- while(TransferCompleteFlag == RESET)
- {
- }
-
- /* Check data integrity*/
- pBuffer = (uint32_t*)&aDST_Buffer;
- for(counter = 0; counter <(sizeof(aSRC_Const_Buffer)/4); counter++)
- {
-
- if(aSRC_Const_Buffer[counter] != *pBuffer)
- {
- compareErrorDetected++;
- }
- pBuffer++;
- }
-
- if (compareErrorDetected != 0)
- {
- /* Toggle LED1 */
- BSP_LED_Off(LED1);
- compareErrorDetected = 0;
- BSP_LCD_DisplayStringAtLine(10, (uint8_t *)" Data comparation failed! ");
- }
- else
- {
- /* Turn LED1 on */
- BSP_LED_On(LED1);
- BSP_LCD_DisplayStringAtLine(10, (uint8_t *)" Data comparation success! ");
- }
-
- while (1)
- {
- }
- }
- static void MPU_Config(void)
- {
- /* Disable MPU */
- MPU->CTRL &= ~MPU_CTRL_ENABLE_Msk;
- /* Configure RAM region as Region N°0, 256kB of size and R/W region */
- MPU->RNR = SRAM1_REGION_NUMBER;
- MPU->RBAR = SRAM1_ADDRESS_START;
-
- /* Write-Back policy */
- MPU->RASR = SRAM1_SIZE | MPU_RASR_C_Msk | MPU_RASR_B_Msk | SRAM1_ACCESS_PERMISSION | 1<<MPU_RASR_TEX_Pos;
- /* Enable MPU */
- MPU->CTRL |= MPU_CTRL_PRIVDEFENA_Msk | MPU_CTRL_ENABLE_Msk;
- }
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